Die head



1933- H. T1 SHEAREI ET AL I ,2 6

DIE HEAD Filed Aug. 21.1929 s Sheets-Sheet 1 Harry Shearerebarlesflfleimschis el Jan. 17, 1933. H 'SHEAR'ER ET AL 1.894296 DIEHEAD Filed. Aug. 21. 1929 5 Sheet-Sheet 5 gww'n tow 1 HarryTS/wamrU/mr/esAfiei/wc/ussel ml (It M49411 I Patented Jan. 17, 1933' UNITEDSTATES PATENT OFFICE HARRY '1. SHEARER AND CHARLES A. BEIMSCHISSEL, OFWAYNESBORO, PENNSYL- VANIA, ASSIGNORS TO LANDIS MACHINE COMPANY, OFWAYNESBORO, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA DIE HEADApplication filed August 21, 1929. Serial No. 387,499. A

Our invention relates to die heads, and parholding or driving unit andto provide means wherebythe front unit may float relative to the rear orholding and driving unit; and to provide further that the locking anddriving members shall be independent of each other. i glgi' A furtherobject is to provide a die head in which a floating action is secured tothe locking members and in which the locking members are contained inthe floating unit and are not influenced by the holding or driving unit.

A further object of the invention is to provide a die head wherein thelocking means is permitted to float with the thread cutting carryingmeans, and wherein the thread cutting carrying means and locking meansare permitted to float relative to the die head holding sha A furtherobject of the invention is to pro-- vide a die head having a floatingfront unit in which the locking mechanism is unaffected by the floatingof the front unit.

A further object of the invention is to provide a die head composed oftwo units in which the front unit is driven by pins on the rear' unit,so that the driving or resultant forces are carried by the pins insteadof by the closing and locking means.

, In constructions heretofore used, the locking pins bore the resultantforces of the cutters, such constructions being shown and described forexample in Patent #1,631,556 to Harry'T. Shearer and in Patent #1,692,-514 to Samuel F. Newman and James G Harper.

In constructions heretofore shown as in Patent #1599994 to Harry T.Shearer, the resultant forces of the cutters are carried by thetrunnions and the worm connected to the driving shank or body whereas inthis construction, the resultant forces are carried by pins in theholding or driving unit which are independent of the trunnions, lockingpins or worms and at the same time this allows the opening action of thehead to be the pull-ofl type or self-contained without relying onmechanical means such as spiders, yokes, cams, etc.

Further general objects are to provide a die head in which the cuttingand locking members float relative to the driving shank or drivingmember, and wherein misalignment of the work will not afl'ect thelocking means.

A further object is to provide a die head in which the resultant forcesof cutting threads do not act through the locking means to the holdingshank or driving member.

A still further object is to provide a die head employing tan entialchasersr .d trunnions'mounted in a ody carrying tne same, in which theunit carrying the cutting members allgns itself with the stock beingcut, which stock can be eccentric with the shank or driving memberwithout causing a rocking action upon the locking pins.

Further objects and advantages will become apparent as the descriptionproceeds.

Referring to the accompanying drawings,

which are made a part hereof and on which similar reference charactersindicate similar parts,

Figure 1 is a lateral sectional view of the die head in locked closedposition taken on l1ne 11 of Fig. 2 and on line 11 of Fig. 3. F gure 2is a section on line 2-2 of Fig. 1. F gure 3 is a face View of the diehead. Figure 4 is a section on line 4-4: of Fig. 2, showing the parts inclosed position.

Figure 5 is a section on line 5-5 of Fig. 2 showing the parts in openposition.

Figure 6 is a section on line 66 of Fig. 2 showing the parts in closedposition.

Figure 7 is a view on line 7-7 of Fig. 2, showing the parts in closedposition.

Figure 8 is a section on line 8-8 of Figure 2, showing the parts in openposition.

Figure 9 is a view looking in the direction indicated by arrows on line9-9 of Figure 1. Figure 10 is a section of line 1010 of Fig. 9.

- of Figure 12 showing parts in closed position.

Figures 15 and 16 are sections on line 1515 of Figure 12 and showpositions of rings mounted on shank in open position and at point ofopening position respectively.

In the drawings, numeral 20 indicates the body member of the front unitof the die head having an opening ring 21 surrounding the front end, andan adjusting ring 22 surrounding the head body member just to the rearof the opening ring, said opening and ad justing rings having mountedtherein opening means comprising a pin 23 on one ring and an abutment 24on the other and a spring 25 acting against the pin on one end andagainst the abutment on the other and adjusting means comprising a worm26 and a worm gear 27 as shown in Figure 2 same being shown anddescribed in Patents #1,631,556 and #1,692,514. The body member 20 has aflange 28 made integral therewith, for holding the opening ring fromforward movement on the head body. A ring plate 29 is secured to therear of the body member 20. Pins 30 are secured in the body member 20(Figure 8) and serve to take the resultant force of threading-and willhereinafter be more fully described. Chaser holders 31 carryingtangential chasers 32 are mounted upon trunnions positioned in bores inthe front head body member 20 and pivotally connected by means of pins33 and block 34 to the opening ring 21 so that relative rotation of theopening ring and the front head body member will open and close thethread cutting jaws or chasers. The extended ends of the trunnions 35pass through the rear ring plate 29 and are secured by means of nuts 36and lock screws 37 having a conical end which seats in a correspondinconical cavity in an end of the trunnion. locking ring 38 has mountedtherein blunt end pins 39 which extend through bores in the adjustingring 22 into bushings 40 in the ring 21. Ring 38 is connected to theadjusting ring 22 by means of screws 41 and spring 41; the screws 41pass through bores inring 38 and screw into ring 22. These screws andsprings serve to position ring 38 and blunt end pins 39 in their lockedclosed position. The front unit com rising all the above numbered anddBSCII ed parts because of clearances 424344-45 and 45' is free to floatin relation to holding or driving member 46 and its component parts. Theholding or driving member 46 has a projecting flange 47 in which aremounted rods '48 46 to aid in the floating action of the front unit,flange 52 also forming a stop for ring 38 when the remainder of thefront unit moves forward in opening action. Member 46 has bores 54 toreceive pins 30 said bores being of such size as to make clearances 45about the ends of pins 30, said bores and pins constituting the meansfor taking the resultant cutting forces.

The die head is in locked closed position as shown in Figure 1. Thedriving and holding member 46 is fastened into a machine (not shown)performing the threading or other work in combination with the threadingand the die head is advanced upon the work through the medium of member46. The die head having cut the proper length of thread member 46 isstopped in its axial travel by means (not shown) the chasers beingengaged in cutting screw threads draws the front unit comprising bodymember 20, rings 212229-38 and all their integral parts forward causinga separation as shown in Figures 5 and 8, this separation being madeagainst compression springs 51. The ring 38 being stopped in its travelby flange 52 withdraws pins 39 from the bushings 40 allow-- ing the ring21 to rotate, which rotation effects the opening of the head; and partstake positions as shown in Figures 5 and 8. A return of the parts to thelocked thread cutting position is obtained by rotating ring 21 for whichpurpose a handle 58 is shown the head taking its locked closed positionas shown in Figure 1, when bushings 40 align themselves with pins 39.

It will be noted that as the opening action takes place springs 51acting between the holding and driving member 46 and the body member 20brings body member to the same position as taken by this member when thedie head is closed and that ring 38 takes a position independent of theremainder of the front unit as shown in Figures 5 and 8, also that aclearance is provided at 56 to permit ring 38 to move a part of themovement which the front unit takes relative to the rear unit.-

The above description applies to the die head as shown in Figures 1 to10 and we have shown a modification of this die head in Figures 11 to16. The die head shown as a modification works essentially in the samemanner as the die head shown in Figures 1 to 10 exmounted in chaserholders 31' which are detachably mounted on trunnions 35' also ring 38has a plate 38 attached to it which in conjunction with flange 52'limits the movement of ring 38. The head in Figures 1 to 10, asdescribed in the above paragraph operates so that as the opening actiontakes place, springs 51 acting between the holding and driving memberand the head body member brings the body member to the same positiontaken by this member when the'die head is closed. In the modified diehead, shown in Figures 11 to 16 the ring 38 prevents the body memberfrom assuming its closed position until such time as ring 21' is rotatedand bushings 40 come into alignment with pins 39. To limit the travel offront unit on modified die head a split washer 57' surrounds a recess onrod 48'.

It will be obvious to those skilled in the art that various changes maybe made in our device without departing from the spirit of theinvention, and we therefore, do not limit ourselves to what is shown inthe drawings and described in the' specification but only as set forthin the appended claims.

Having thus fully described our said invention, What we claim as new anddesire to secure by Letters Patent, is:

1. A die head comprising a body member, trunnions mounted in the bodymember, chaser holders mounted on the trunnions, tangential chasers inthe holders, a plurality of rings surrounding the said body memher, oneof said rings being connected to the said chaser holders, means in saidrings for opening and adjusting the die head, the said rings beingpositioned laterally of said body member by a flange on the body member,and a ring plate attached to the said body member, a ring carryinglocking pins connected to the said plurality of rings and rotatableabout the body member with said plurality of rings, said ring beingpositioned on a shank slidably connected to said body member, the saidring being limited in its axial movement relative to said shank in bothopen and locked position substantially as set forth.

2. A thread cutting die head comprising a front unit and a rear unit,the front unit carrying an opening ring, an adjusting ring and chaserholders carrying tangential threadcutting chasers, the rear unitcarrying a locking ring, blunt end pins mounted in said locking ring forlocking the die head in operative position, clearance provided betweensaid locking ring and rear unit whereby the front unit may have afloating action in relation to the rear unit to care for misalignment ofwork, driving pins mounted in said front unit registering in boresinsaid rear unit, and means whereby an axial movement of the front unitrelative to the rear unit withdraws the blunt pins from locked position,and means for opening the heads when the said blunt end pins arewithdrawn, substantially as set forth.

3. A thread cutting die head comprising a front unit having a bodyportion with an opening ring and an adjusting ring mounted thereon, arear unit having a body portion with a locking ring mounted thereon,blunt end pins carried by said locking ring, said pins engagingbores inthe opening ring to hold said opening ring in locked position,

pins carried by the front body member extending into bores in the rearbody for driving the former by the latter, and resilient means forholding the front and the rear body members together yieldably to permita slight axial movement therebetween, such movement permitting thewithdrawal of the blunt end pins from the bushings in the opening ring,and means for opening the head when the said blunt end pins arewithdrawn, substantially as set forth.

4. A thread cutting die head comprising a front body member havingopening and adjusting rings mounted thereon, a flange on the frontportion of the body member, a plate secured to the rear of the bodymember for securing the rings on the body member, a shank orv holdingmember having a locking ring mounted thereon, a flange on the frontportion of the shank to limit the forward movement of said locking ring,a plurality of pins secured in the said shank and extending into boresin the front body member, springs surrounding said pins engaging headson the pins at one end and the said plate on the rear of the front bodymember at the other end, said springs tending to hold the front bodymember and said shank together, said locking ring carrying blunt endpins the ends of which engage in bores in the opening ring to lock theopening ring in thread cutting position, the faces of said blunt endpins holding the front body member and the rings mounted thereon fromsaid shank when the head is in open position, substantially as setforth.

5. A thread cutting die head comprising a front unit "and a rear unit,the front unit carrying an opening ring, an adjusting ring and chaserholders carrying tangential thread cutting chasers, the rear unitcarrying a locking ring, blunt end pins mounted in said locking rlng forlocking the die head in operative position, said front unit registeringin bores in said rear unit,'and means whereby an axial movement of thefront unit relative to the rear unit withdraws the blunt pins fromlocked driving pins mounted 111,

connected to said body member,

rings surrounding the said body member, one of said rings beingconnected to the said chaser holders, ing and adjusting the die head, aring carrying locking pins connected tothe said plurality of rings androtatable about the body member with said plurality of rings, said ringbeing positioned on a shank the said ring being movable axially of theshank and limited in its axial movement relative to said shank in bothopen and locked position, substantially as set forth.

7. A thread cutting die head comprising a front unit and a rear unit,the front unit carrying an opening ring, an adjusting ring and chaserholders carrying tangential thread cutting chasers, the rear unitcarrying a locking ring, blunt end pins mounted in said locking ring forlocking the die head in operative position, driving pins mounted in oneof said units registering in bores in the other of said units, and meanswhereby an axial movement of the front unit relative to the rear unitwithdraws the blunt pins from locked position, and means for opening theheads when the said blunt end pins are withdrawn, substantially as setforth.

In witness whereof, we have hereunto set our hands and seals atWaynesboro, Pennsylvania this ninth day of August, A. 1). nineteenhundred and twenty-nine. I

HARRY T. SHEARER. CHARLES A. REIMSOHISSEL.

means in said rings for openslidably

